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WorksheetsKinetics practice 2
Total questions: 10
Worksheet time: 20mins
Which statements are correct?
I. The activation energy of a reaction is not affected by temperature.
II. A catalyst reduces the enthalpy change of a reaction.
III. Catalysts provide alternative reaction pathways.
I and II only
I and III only
II and III only
I, II and III
Which factors can affect the rate of reaction?
I. Particle size of solid reactant
II. Concentration of reacting solution
III. Pressure of reacting gas
I and II only
I and III only
II and III only
I, II and III
The diagram shows the energy profile for a catalysed and uncatalysed reaction.
Which represents the enthalpy change, ΔH, and the activation energy, Ea, for the catalysed reaction?
ΔH is z, Ea (catalysed reaction) is x + z
ΔH is z, Ea (catalysed reaction) is z + y
ΔH is -z, Ea (catalysed reaction) is x
ΔH is z + x, Ea (catalysed reaction) is x
Which variable is best to use when determining the rate of decomposition of hydrogen peroxide?
2H2O2(l) → 2H2O(l)+O2(g)
Volume of solution
Volume of gas
pH of solution
Conductivity of solution
Which is a correct unit for expressing the rate of a reaction?
mol L-1 s-1
mol L-1 s
mol s
mol-1 L s-1
1.00 mol L−1 solution of hydrochloric acid is added to 2.00 g of small pieces of calcium carbonate at 20°C. The volume of carbon dioxide produced against time is plotted to give curve P.
Which change will produce curve Q, given that calcium carbonate is always the limiting reagent?
Increasing the volume of the hydrochloric acid to 200 mL
Increasing the mass of calcium carbonate to 4.00 g
Increasing the concentration of the hydrochloric acid to 2.00 mol L−1
Replacing the 2.00 g of small pieces of calcium carbonate with 2.00 g of larger pieces of calcium carbonate
Which quantity can be changed by the use of a catalyst?
I and II only
I and III only
II and III only
I, II and III
The diagram represents the Maxwell‒Boltzmann energy distribution curve of the reactants for a chemical reaction with different activation energies, Ea1 and Ea2.
What is the reason why the rate of the reaction with activation energy Ea2 is greater?
More frequent collisions between the particles occur.
More energetic collisions between the particles occur.
A catalyst has been added.
The temperature is higher.
Which change increases the rate of a chemical reaction?
Increasing the size of solid reactant particles
Decreasing the concentration of aqueous reactants
Increasing the surface area of a solid reactant
Decreasing the pressure of gaseous reactants
Which is not affected by an increase in temperature?
Rate of reaction
Collision frequency
Collision geometry
% of molecules with E ≥ Ea
